**Core Concept**
Geographic tongue, also known as benign migratory glossitis, is a condition characterized by the appearance of irregular, migrating areas of depapillation on the tongue. This condition is often associated with benign, self-limiting inflammation of the tongue and is typically seen in otherwise healthy individuals.

**Why the Correct Answer is Right**
Geographic tongue is a benign condition that typically presents with well-demarcated, migratory areas of depapillation on the dorsal surface of the tongue. The exact cause of geographic tongue is unknown, but it is thought to be related to minor trauma, hormonal changes, or genetic predisposition. The condition is often associated with other oral mucosal conditions, such as atrophic glossitis and lichen planus.

**Why Each Wrong Option is Incorrect**
**Option A:** Geographic tongue is often associated with systemic conditions, such as iron deficiency anemia, vitamin B12 deficiency, and autoimmune disorders. This statement is false because geographic tongue is typically seen in otherwise healthy individuals.
**Option B:** Geographic tongue is a type of oral cancer. This statement is false because geographic tongue is a benign condition that is not associated with cancer.
**Option C:** Geographic tongue is characterized by the presence of white patches on the tongue. This statement is false because geographic tongue is typically characterized by the appearance of irregular, migrating areas of depapillation (loss of papillae) on the tongue.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of geographic tongue is its benign and self-limiting nature, meaning that it typically resolves on its own without treatment.

**Correct Answer: B. Geographic tongue is a type of oral cancer.**